NASA explains how close the Asteroid will come to Earth

An asteroid about half the size of a football field will wiz by the earth Friday, about 17,200 miles away.

http://www.wtsp.com/video/2167836508001/0/NASA-explains-how-close-the-Asteroid-will-come-to-Earthhttp://bc_gvpc.edgesuite.net/img/963482463001/201302/2335/963482463001_2167792435001_961896998-160-1360947240342.jpg?pubId=963482463001NASA explains how close the Asteroid will come to EarthAn asteroid about half the size of a football field will wiz by the earth Friday, about 17,200 miles away.vpcbesttechnologyEarthDA14NASA2012weathervpcNational NewsasteroidUSA Today01:32